Upgraded Audio: Engineered to deliver the same build and clarity as the original SoundCore, with upgraded 2x 6W high-performance drivers. Bigger Bass: Anker's trademark Bass Up technology provides a wide sound range, with deep lows. Incredible Battery Life: 24-hour / 500-song playtime powered by a built-in high capacity Li-ion battery and Anker's industry-leading power management technology. And most of all, it is waterproof!